On Sun, 28 Nov 2004 12:23:04 +0000 (UTC), "Regosaurus"
wrote:

Just a comment.

Even such a thing as a small 1/2-watt resistor has distributed R, L and C.

Indeed.

L and C can be calculated from physical dimensions.

Only if you have x-ray vision. The package gets in the way.

A resistor can be treated as a helically-loaded transmission line in exactly
the same way as a helically-loaded antenna. If the frequency is high enough
the radiation resistance can be taken into account.

Just calculate the input resistance of the line with a short circuit at the
other end and the job is done. The performance of dummy-load resistors can
be determined in the same way.

If you (in the plural) are unable to do this then you are unworthy to call
yourselves engineers. Whatever happened to your education? ;o)

I've never described myself as an engineer. I'm not one! But if I
wanted to checkout how suitable any given resistor was for a dummy
load, I'd use a network analyser.
--

"What is now proved was once only imagin'd." - William Blake, 1793.